I try to be fair in my criticisms, so I would have to agree that asserting a negative (the unlikely route from a
racemic mixture of amino acids of the Miller Experiment to a functional cell) does not "prove God".
For Gods existence (and nature) I suggest you look for the positive evidences that suggest it, rather than simple negation of other plausible options.
As to the scientific issue I have here, this summarises it well...
"Nearly all biological polymers must be
homochiral (all its component monomers having the same handedness. Another term used is optically pure or 100 % optically active) to function. All amino acids in proteins are ‘left-handed’, while all sugars in DNA and RNA, and in the metabolic pathways, are ‘right-handed’.
A 50/50 mixture of left- and right-handed forms is called a
racemate or
racemic mixture. Racemic polypeptides could not form the specific shapes required for enzymes, because they would have the side chains sticking out randomly. Also, a wrong-handed amino acid disrupts the stabilizing α-helix in proteins. DNA could not be stabilised in a helix if even a single wrong-handed monomer were present, so it could not form long chains. This means it could not store much information, so it could not support life."
https://creation.com/origin-of-life-the-chirality-problem